Higher-than-ballistic conduction of viscous electron flows
Higher-than-ballistic conduction of viscous electron flows
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DOI：
10.1073/pnas.1612181114
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发表时间：
2017-03-21
影响因子：
11.1
通讯作者：
Levitov, Leonid S.
中科院分区：
文献类型：
--
作者：
Guo, Haoyu;Ilseven, Ekin;Levitov, Leonid S.
强相互作用的电子可以以一种整齐协调的方式运动，让人想起粘性流体的运动。在这里，我们表明，在粘性流，相互作用促进运输，允许电导超过基本的Landauer的弹道极限球。该效果是特别引人注目的流动通过一个粘性点接触，收缩表现出量子力学弹道传输在T = 0，但在高温下由电子流体力学。我们开发了一个理论的弹道粘性交叉使用的方法的基础上准流体动力学变量。电导被发现服从一个加性关系G = G（球）+ G（维斯），其中的粘性贡献Gvis占主导地位的Gball在流体动力学限制。超弹道、低耗散输运是粘性电子学的一般特征。
Strongly interacting electrons can move in a neatly coordinated way, reminiscent of the movement of viscous fluids. Here, we show that in viscous flows, interactions facilitate transport, allowing conductance to exceed the fundamental Landauer's ballistic limit Gball. The effect is particularly striking for the flow through a viscous point contact, a constriction exhibiting the quantum mechanical ballistic transport at T = 0 but governed by electron hydrodynamics at elevated temperatures. We develop a theory of the ballistic-to-viscous crossover using an approach based on quasi-hydrodynamic variables. Conductance is found to obey an additive relation G = G(ball) + G(vis), where the viscous contribution Gvis dominates over Gball in the hydrodynamic limit. The super-ballistic, low-dissipation transport is a generic feature of viscous electronics.